function loadPortalMap(configOptions) {     esri.arcgis.utils.arcgisUrl = configOptions['portalUrl'] + "sharing/content/items";     var webmapID = configOptions['webMapId'];     viewDefinition = configOptions['lyrDefn'];     //Get webmapID from country code     //Create the appropriate dropdowns describing the layers to draw     for (var index = 0; index < viewDefinition.length; index ++) {         var item = viewDefinition[index];         var dType = item[0];         var optn = document.getElementById(dType);         var option = document.createElement("option");         option.text = item[1];         option.value = index;         try {             optn.add(option, null);         } catch (error) {              optn.add(option);         }     }      var params = { q: 'id:' + webmapID };     var mapDeffered = esri.arcgis.utils.createMap(webmapID, 'map', { mapOptions: {         logo: false,          showInfoWindowOnClick: false,         sliderStyle:"small"     } });          mapDeffered.addCallback(function(response) {         var layers = response.itemInfo.itemData.operationalLayers;         dojo.forEach(layers, function(layer) {             if (!layer.featureCollection){                  layerInfo.push({"layer":layer.layerObject,"title":layer.title});              } else {                 dojo.forEach(layer.featureCollection.layers, function(featLyr) {                     layerInfo.push({"layer":featLyr.layerObject,"title":featLyr.title});                  });             }         });                      createLegend(layerInfo, mapDeffered.results[0].map);                 layerInfo.reverse();         //changeMap();         //Set the description information from the item to          $("#tableDiv").html("<h2>Data</h2><div id='innerText'>" + response.itemInfo.item.description + "</div>");     });      mapDeffered.addErrback(function(error) {         //Do something here if map doesn't load properly         var something = error;     });           }
					
				
			
			
				
			
			
				Solved! Go to Solution.
<!DOCTYPE html>   <html>   <head>   <title>Create a Web Map</title>   <meta http-equiv="Content-Type" content="text/html; charset=utf-8">   <meta http-equiv="X-UA-Compatible" content="IE=7,IE=9">    <link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/3.2/js/esri/css/esri.css">   <style>     html,body,#mapDiv,.map.container{       padding:0;       margin:0;       height:100%;     }   </style>    <script>var dojoConfig = { parseOnLoad:true };</script>   <script src="http://serverapi.arcgisonline.com/jsapi/arcgis/3.2compact"></script>   <script>     dojo.require("esri.map");     dojo.require("esri.arcgis.utils");      var map;        function init(){       var webmapid = "286b722cfaf04eee98b8a8a491fd1af5";       esri.arcgis.utils.createMap(webmapid, "mapDiv").then(function(response){         map = response.map;       });     }      dojo.ready(init);   </script>    </head>    <body>     <div id="mapDiv"></div>   </body>   </html>function changeMap() {
    var ptSel = document.getElementById("point");
    var ptIdx = ptSel.value;
    
    var rasSel = document.getElementById("raster");
    var rasIdx = rasSel.value;
    
    //Define the %in% function
    Array.prototype.contains = function(obj) {
        var i = this.length;
        while (i--) {
            if (this == obj) {
                return true;
            }
        }
        return false;
    }
    
    //The value from each of these dropdowns can be used to get the index of the layer definition we need to show
    var ptsToShow = viewDefinition[ptIdx][2];
    var rasterToShow = viewDefinition[rasIdx][2];
    var allVals = ptsToShow.concat(rasterToShow);
    
    for (var index = 0; index < layerInfo.length; index ++) {
        var lyrItem = layerInfo[index];
        if (allVals.contains(index)) { lyrItem.layer.show(); } else { lyrItem.layer.hide(); };
    }
}
					
				
			
			
				
			
			
				
			
			
			
			
			
			
		<!DOCTYPE html>   <html>   <head>   <title>Create a Web Map</title>   <meta http-equiv="Content-Type" content="text/html; charset=utf-8">   <meta http-equiv="X-UA-Compatible" content="IE=7,IE=9">    <link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/3.2/js/esri/css/esri.css">   <style>     html,body,#mapDiv,.map.container{       padding:0;       margin:0;       height:100%;     }   </style>    <script>var dojoConfig = { parseOnLoad:true };</script>   <script src="http://serverapi.arcgisonline.com/jsapi/arcgis/3.2compact"></script>   <script>     dojo.require("esri.map");     dojo.require("esri.arcgis.utils");      var map;        function init(){       var webmapid = "286b722cfaf04eee98b8a8a491fd1af5";       esri.arcgis.utils.createMap(webmapid, "mapDiv").then(function(response){         map = response.map;       });     }      dojo.ready(init);   </script>    </head>    <body>     <div id="mapDiv"></div>   </body>   </html>